Probability Rules with Two Way Tables (or Contingency Tables)
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- Опубліковано 7 кві 2019
- This video demonstrates several of the probability rules with a two-way, or contingency table. I include examples of probabilities with "or", "and", "given", and the complement rule. There are several types of probability that can be found from two way tables.
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Four years later and you are still saving people's degrees
Wow I have my test in 30 minutes time and this video is very helpful…I love you ma’am !
Hey really appreciate, you explained something that it took my teacher a whole hr to explain
Thank you SOOO much. I saw a tutor and watched hours and hours of other videos, but could not understand WHY I was getting something wrong on my practice test. I finally understand now. THANK YOU!
I'm glad that you figured it out!
Thanks. Needed a quick refresher for the final.
Thank you so much lady! 🙌🏽I've been struggling with two-way tables and this video helped me a lot! 🙏
Thank you so much!!! I FINALLY understand after hours of studying, rereading the text, my notes, watching other videos, etc. Wish I had started here! You are amazing!!!!
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@@MathandStatsHelp Shouldn't B, be 445 over 877?
@@MathandStatsHelp thank you
@Stella Roper your explanation was pretty detailed . I am taking notes lol thank you
I have literally cried out of frustration over this and 3:40 into this video it clicked. THANK YOU!!!!!
Sorry you got so frustrated, but glad the video helped.
thank you so muchhhhh!!! i finally understand and can do my homework completely
Thank you, this helped me with a difficult last problem before my final assignment.
Thank you for this video. It was extremely helpful
You are explaining this contingency table much much better miss. I am confidently going to teach all my learners this confidently. ❤❤
Thank you very much. The probability now makes so much sense.
You're welcome! I'm glad the video helped
this helped me so much for my stats exam tomorrow!! God bless! Thank you so much for sharing your intelligence!
You're welcome! Good luck on your exam!
Awesome video, thank you!
This is GREAT! Thank you! Thank you! Thank you! Explained given, and, and or! :)
Thank you so so much for this !
Thank you so much this was so helpful 😊
Thank you so much! this was so helpful!!
How come with question A you put 187/394 but in question B you put 445/1550 which was the total instead of putting the total for the column as the denominator
With "and" probabilities, both conditions have to be true. It's the total of both divided the total of people in the study. With "given", you know that it has to come from the given category and use the total from the given.
God bless you! Thank you so so so much! This video was of great help!
I'm happy to hear it helped you! You're welcome!
thanks for the clear explanation it is very helpful
Thank you so much✨👏
I love you!!! Thank you so much
Very helpful, thanks!
You're welcome
Thank you so much!
You're welcome!
Thanks for the help, Stat midterm tomorrow!
Hope you do well!
Thanks to you and the family that made you, because you're a real definition of an Angel since you teach with great skill and even make us understand whatever you teach with relevant examples. You're a real blessing indeed to the world and thank you once more.
You're welcome. I'm happy that I'm able to help so many people!
thanks that helped a lot
You're welcome
How do we know what total we divide by that’s the confusing part to me?
It just depends on the question. It changes from scenario to scenario. When it says given that, then you divide by the total from the given group. If it's talking about out of the whole group, you use the larger total. It takes practice.
So B can i use the formula to get the answer cause that way works for me
made it soo simple an ezyy i swearr
Wouldn't B be 445/877? It seems like the same question as A?
It's different because you are looking out of all students how likely is it to pick someone who is both female and never volunteers. The other one they use the word "given" to tell you the total to look at.
@@MathandStatsHelp Thank you. I was confused as well.
@@MathandStatsHelp what about if the question asks' find the probability of selecting a person who is a female given that they respond"Never volunteers"? I think the answer should be 445/779 for this particular case i.e,P(F|N)=445/779 and for the previous P(N|F)=445/877. Kindly clarify this two scenarios. otherwise thanks so much, you're doing a great job. I wish you blessings
Thank you, you saved my freakin ass. Earned a sub :)
You're welcome! Thanks for subscribing!
Awesome
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#TutorStats
youre the best .
Thank you
isn't we divide 445 by 877 in P(female/never) ??
If you are given to find P(female|never), yes it would be 445/877. The question I asked was P(never|female) so it is 445/779. They are different.
@@MathandStatsHelp actually, you and mention Female, then the word Never. In both questions 1 and 2, you mention gender then their response afterwards. So why did your denominator change for question #2??
In part a, it tells us that we are given the group sometimes volunteer. Our denominator is the group sometimes volunteer for that one, because we are only specifically given that they are from the group sometimes volunteer. The second one doesn't say given female or given never volunteers. Had it used the term given, then the total would be the given category. We are looking for out of all of the people surveyed how many were both female and never volunteers. Part A uses the "given" probability rule and Part B uses the "and" probability rule.
bruh thankyou i really needed this i have a 64 in math😭
You're welcome. Hope your grade can improve.
how about a qn that mentions mutually exclusive
damn shordy u tryna be my math instructor
Our teacher give us a low for Agiven B=pA and B/p(b)if p B not zero the answer differ in last q
There're Few comments bcoz of part B i guess..😀
How to identify 'and' 'or' situation
Typically, it just says it in the problem.
_This video helped a lot im a viral learner and I like how can see where to get my answers. thank you
You're welcome. Glad to hear it helped you.
Very sweet voice
as I am typing this question im asking myself what is the probability that she is going to answer me lol. For B why is it over the total number of people and not the total number of fermales
lol saw below that you have already answered this question thanks a lot
On question 2 how come you put 445 over 1550 and not 445 over 877
Because it's an "and" probability and you are looking for a person out of the entire group that meets both criteria.
@@MathandStatsHelp hi :)
Why is it not 187/1550 since one can pick anybody from the sample
Because you are told they responded sometimes. Given means that you know the given category is known to be true, so you are only looking at the total in the given group.
Regarding problem D,
P(male OR sometimes)= 771/1550 + 394/1550 - 187/1550
The 187/1550 is P(male AND sometimes)
So how come when you multiply P(male) × P(sometimes), it does NOT equal to 187/1550?
Madness.
You can only use the rule P(A and B)=P(A)*P(B) if the events are independent. These aren't independent events.
in 4:44. why is it 445/1550 instead of 445/877
same question
Thanks for ur teaching but u were going fast so next time pls slow it